uP1590
Dual Synchronous Buck Controller with
5V/3.3V 100mA LDOs for Notebook System Power
Features
General Description
The uP1590 is a dual synchronous buck controller with Wide Input Voltage Range: 5.5V to 26V
5V/3.3V 100mA LDOs for notebook system power supply
Two Synchronous Buck Controllers
solution.
Dual Fixed 5V/3.3V Outputs or Adjustable from
The uP1590 supports high efficiency, fast transient
response and provides a combined POK signal. The
ultrasonic mode maintains the switching frequency above
2V to 5.5V
Selectable DEM and USM in Light Load
(uP1590P)
audio frequency, which eliminates noise in audio
applications. The proprietary RCOTTM technology provides
fast transient response and high noise immunity.
Internal Soft-Start and Soft-Discharge
RCOTTM (Robust Constant On-Time) Control
Architecture
4500ppm/OC RDS(ON) Current Sensing
The uP1590 has internal soft-start to control the inrush
current. Other features include over current protection,
over/under voltage protection, power-up sequencing, POK
output, and thermal shutdown. The uP1590 is available
in the space saving package WQFN3x3-20L, specified
from -40OC to 85OC.
100mA 5V/3.3V LDO with Switches
Secondary FB Input Maintains Charge Pump
Voltage (uP1590Q Only)
Power OK Indicator
Applications
OVP/UVP/OCP/OTP
Notebook and Subnotebook System Power
Supplies
WQFN3x3-20L
3-4 Cell Li-Ion Battery-Power Devices
RoHS Compliant and Halogen Free
Dual Output Supplies for DSP, Memory, Logic
and Microprocessor
Ordering Information
Order Number
uP1590PQKF
uP1590QQKF
uP1590RQKF
Package Type
WQFN3x3-20L
Top Marking
uP1590P
uP1590Q
uP1590R
Operation Mode
Selectable by ENM Pin
DEM
Remark
Pin 13: ENM
Pin 13: SECFB
Pin 13: TP
USM
Note:
(1) Please check the sample/production availability with uPI representatives.
(2) uPI products are compatible with the current IPC/JEDEC J-STD-020 requirements. They are halogen-free, RoHS
compliant and 100% matte tin (Sn) plating that are suitable for use in SnPb or Pb-free soldering processes.
uP1590-DS-P0200, Oct. 2013
www.upi-semi.com
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